Update to Rails 4, all tests passing, not sure if application runs

Updated to Rails 4 by re-generating the app, I think I have all
necessary gems but I have not yet tried to run the application

In addition there are a TON of changes to models and tests as part
of upgrading (and some bugs/code cleanup noticed while doing so).
Ignore Coverage Folder
Don't save ldap info as updated if there is an error
Merge pull request #12 from sc0v/Rails4

Rails4